Figure 1 shows the reaction profile for the combustion of methane:
methane+oxygen→carbon dioxide+water\text{methane} + \text{oxygen} \rightarrow \text{carbon dioxide} + \text{water}methane+oxygen→carbon dioxide+water
Based on Figure 1, answer the following:
a.[1]
Which label represents the activation energy?
b.[1]
Which label represents the energy level of the reactants (methane and oxygen)?
c.[1]
What type of chemical reaction is this, since it releases energy to the surroundings?